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Prediction of Shear Capacity of Slender Reinforced Concrete Beams with Steel Fiber
Journal of Advanced Concrete Technology ( IF 2 ) Pub Date : 2020-04-17 , DOI: 10.3151/jact.18.179
Narawit Hemstapat 1 , Kazumasa Okubo 1 , Junichiro Niwa 1
Affiliation  

The objective of this research is to propose a simple and accurate prediction method for the shear capacity of reinforced concrete beams with steel fiber (RSF beams). Steel fiber reinforced concrete (SFRC) is being widely used nowadays, with the steel fibers added to the concrete to improve the tensile resistance. First, this research aims to investigate the material properties of SFRC in various concrete compressive strengths, shapes of steel fiber and volume fractions of steel fiber. In order to evaluate the shear capacity, several material properties, such as tension softening curves and fracture energy were investigated in the material tests. Second, four-point bending tests of RSF beams were conducted in order to investigate the shear capacity and diagonal crack pattern. Eight RSF beams with various concrete compressive strengths, volume fractions of steel fiber and stirrup ratios were fabricated and tested. The results revealed that the concrete compressive strength and steel fiber significantly affect the shear capacity of RSF beams. Finally, the shear equation for the RSF beams failing in a diagonal tension failure mode has been proposed by focusing on the residual tensile stress perpendicular to the critical diagonal crack at the failure condition.

中文翻译:

钢纤维细长钢筋混凝土梁抗剪承载力预测

本研究的目的是提出一种简单而准确的钢纤维混凝土梁(RSF 梁)的抗剪承载力预测方法。钢纤维增强混凝土(SFRC)是当今被广泛使用的,在混凝土中加入钢纤维以提高抗拉强度。首先,本研究旨在研究不同混凝土抗压强度、钢纤维形状和钢纤维体积分数下 SFRC 的材料特性。为了评估剪切能力,在材料试验中研究了几种材料特性,例如拉伸软化曲线和断裂能。其次,进行了 RSF 梁的四点弯曲试验,以研究抗剪能力和对角裂纹模式。八根具有不同混凝土抗压强度的 RSF 梁,制造并测试了钢纤维的体积分数和箍筋比率。结果表明,混凝土抗压强度和钢纤维显着影响RSF梁的抗剪承载力。最后,通过关注破坏条件下垂直于临界对角裂纹的残余拉应力,提出了在对角拉伸破坏模式下破坏的 RSF 梁的剪切方程。
更新日期:2020-04-17
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